Used in class rooms to demonstrate high voltage effects on evacuated tubes and Chemicals. The butterfly is made of metal, coated in different minerals, when the electrons hit the elements they glow in the associated colour for that type. The principal is similar to a modern flourescent tube. We can demonstrate this item in the museum along with a number of other electrical objects.
CROOKES TUBE WITH BUTTERFLY
Contributed by Museum of Technology Hemel Hempstead
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